Piston Ring Set 4.040 1.5 1.5 3.0mm

The Piston Ring Set 4.040 1.5 1.5 3.0mm from Hastings is designed for high-performance engine rebuilds and precision work, where exact bore diameter and ring geometry are essential. This set is ideal for builders and mechanics who require OEM-quality compression and oil control for both stock restorations and modified engines. Whether you're working on a street engine, preparing for a dyno session, or restoring a classic vehicle, the right piston ring set is crucial for optimal performance.

This Hastings ring set features a bore diameter of 4.040 inches, with precisely dimensioned compression and oil control rings—1.5mm for the top compression ring, 1.5mm for the second ring, and 3.0mm for the oil control ring. Manufactured to tight tolerances, these rings ensure consistent groove fit and effective gas sealing. Hastings employs advanced coating and material science techniques to enhance resistance to scuffing, wear, and thermal cycling, which are critical for engines operating under high RPM or boost conditions.

These piston rings are particularly beneficial for small-block and mid-displacement engine applications that utilize a 4.040-inch bore, making them suitable for popular platforms in street rods, drag builds, and vintage muscle car restorations. Proper installation requires honing the cylinder wall to ensure optimal performance and longevity. With their three-piece design, these rings balance traditional reliability with modern manufacturing standards, providing the necessary seal consistency for builds targeting over 400 horsepower or for daily drivers.